Apparatus for photographic color recording

ABSTRACT

A photographic objective, in whose plane a set of filter strips associated with different colors is located, forms an image on a black and white film while the lens elements of a lenticular grating form images of the set of colored strips on the corresponding areas of the film. All strip images together form a strip grating on the film so that the image formed by the objective can be reproduced as a color picture by the diffraction orders of the strip grating.

United States Patent Bestenreiner et al.

APPARATUS FOR PHOTOGRAPHIC COLOR RECORDING lnventors: FriedrichBestenreinen Grunwald, near Munich; Reinhold Demi, Munich, both ofGermany Assignee: AGFA-Gevaert Aktiengesellschaft, Leverkusen, GermanyFiled: June 3, 1969 Appl. No.: 830,065

Related US. Application Data Continuation-impart of Ser. No. 803,676,Mar. 3, 1969, abandoned.

Foreign Application Priority Data June 4, 1968 Germany ..P 17 72 568.7

US. Cl ..95/ 12.21 Int. Cl. ..G03b 33/14 Field of Search ..95/l2.2,12.21; 355/33, 40

Feb. 15, 1972 [56] References Cited UNITED STATES PATENTS 1,746,5842/1930 Fournier ..355/33 X 2,382,604 8/1945 Capstaff ..355/33 3,408,14310/1968 Mueller ....355/40 3,478,661 11/1969 Hecksher..... ...95/12.23,504,606 4/1970 Macovski ..95/ l 2.2

Primary Examiner.lohn M. Horan Attorney-Michael S. Striker ABSTRACT Aphotographic objective, in whose plane a set of filter strips associatedwith different colors is located, forms an image on a black and whitefilm while the lens elements of a lenticular grating form images of theset of colored strips on the corresponding areas of the film. All stripimages together form a strip grating on the film so that the imageformed by the objective can be reproduced as a color picture by thediffraction orders of the strip grating.

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SHEET 3 OF 3 IN VEN TOR.

FRIEDRICH BESTENREINER y REINHOLD DEML APPARATUS FOR PHOTOGRAPHIC COLORRECORDING REFERENCE TO A RELATED APPLICATION The present application isa continuation-in-part application of our copending application Ser. No.803,676, filed Mar. 3, 1969 entitled PHOTOGRAPHIC RECORDING ANDREPRODUCING METHOD AND APPARATUS, now abandoned.

BACKGROUND OF THE INVENTION Known arrangements for producing by means ofa lenticular grating an image on a black and white film, and copying theblack and white film to produce a color picture, have the disadvantagethat due to difficulties in the coincidence of the lenticular grating,it is hardly possible to make good reproductions.

It is one object of the invention to overcome this disadvantage of theprior art, and provide a method and apparatus for recording on a blackand white film by means of a lenticular grating in such a manner thatthe developed photographic film can be copied without difficulties.

Another object of the invention is to provide a new method of makingcolor photographs, and an apparatus serving this purpose.

Another object of the invention is to produce photographic recordings ona photographic surface which include a grating whose difiraction ordersare used for printing and reproduction of the picture on thephotographic film.

With these objects in view, a method of the invention comprises thesteps of forming a photographic object image on a photosensitivesurface; and forming by a lenticular grating a plurality of color imagesof a set of filter strips associated with different color components oflight on the photosensitive surface. In this manner, a strip gratingcomposed of the images of the strips is recorded on the photosensitivesurface, and the object image can be reproduced as a color picture bythe diffraction orders of the strip grating. The filter strips which areassociated with different color components have different widths, andare arranged in parallel positions, or in crossing angular positions.The strip grating on the photosensitive surface has a correspondingpattern with different grating constants or with different azimuthangles.

In order to obtain during the reproduction sufficient diffractionphenomena, the grating constants of the lenticular grating must be veryhigh. Therefore, in addition to the known lenticular gratings consistingof synthetic materials, photographically made gratings are suitable,which are produced by exposing a corresponding sinusoidal strip gratingon a suitable photosensitive layer which is then developed andrehalogenized. Lenticular gratings produced in this manner have not onlyan outer modulation, but also a periodic variation of the index ofrefraction, which has the efiect of a cylinder lens when lighting ofsuitable intensity is used.

A black and white picture produced in accordance with the invention on aphotosensitive surface can be developed in the usual manner, and printedas a contact print, or reproduced in any other manner without anynoticeable loss on picture quality.

For this purpose, the images on photosensitive layer are illuminated bya source of light which is as point-shaped as possible, which is imagedby a condenser on an intermediate diaphragm. When the image-carryingphotographic layer is disposed behind the condenser, pronounceddiffraction effects take place, which can be either filtered, or usedfor producing a picture.

One embodiment of an apparatus for photographic color recording inaccordance with the invention comprises an objective; a set of differentfilter strips associated with different color components located in theplane of the objective; a lenticular grating located between theobjective and a photosensitive surface, covering the latter, andincluding a plurality of lens elements for projecting the filter raysassociated with different color components onto correlated areas of thephotosensitive surface, respectively. Each lens element fonns an imageof the set of strips on the respective area whereby all images of thestrips form a grating on the entire photosensitive surface. This permitsthe reproduction and copying of the image formed by the objective on thephotosensitive surface as a color picture by the diffraction orders ofthe grating.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodimentswhen read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a fragmentary schematicsectional view illustrating a first embodiment of the invention by whichcolors are recorded by means of different grating constants, andincluding a diagram showing the distribution of the color components;

FIG. 2 is a diagrammatic view graphically illustrating the lightpermeability and transparency of the filter strips used in theembodiment ofFIG. 1;

FIG. 3 is a fragmentary schematic perspective exploded view illustratinga second embodiment of the invention in which the filter strips areangularly displaced;

FIG. 4 is a view illustrating the positions of the filter strips in theembodiment of FIG. 3;

FIG. 5 is a fragmentary schematic view illustrating an apparatus forreproducing pictures made in accordance with the embodiments of FIGS.1-4; and

FIG. 6 is a schematic view illustrating the distribution of the colorcomponents in the diaphragm plane of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIGS. 1 and2, an objective has front and rear parts 1a and lb which form a realimage of an object located forwardly of lens part 1a on a photosensitivesurface 2 provided on a black and white film having very high resolutionand good modulation transmission. A lenticular grating 3 has a planarsurface in direct contact with the photosensitive layer 2, andconsisting of lens elements 3a and 3b which are cylinder lenses havingsuch a power of refraction that a set 4 of filter strips is sharply andaccurately imaged on the photosensitive layer 2. The lenticular grating3 has, for example, 60 lens elements per millimeter, and this fine pitchfavorably influences the quality of the picture.

Objective la, Ib has a plane of symmetry passing through the opticalaxis and being parallel to the axes of the lens elements 3a, 3b. The setof filter strips 4 consists of four pairs of filter strips, namely aninnermost pair of filter strips 4b, which define between each other astripshaped area 40, and further pairs of filter strips 4a, 4d, and 4e,the filter strips of each pair being arranged symmetrical to the planeof symmetry and parallel to each other. .The area or strip 4a ispermeable for all three color components, and is flanked by two verynarrow yellow filter strips 4b which, as is apparent from FIG. 2,completely absorb the color component blue. A pair of filter strips 40is associated with the color component red, and since the central strip4a, and the yellow filter strips 4b are also permeable for red light,the cylinder lens 3a images a continuous red stripe symmetrical to theaxis of the cylinder lens 3a, and shown as part of the graph 5 in FIG.1, while the permeability for the red light is indicated in theuppermost portion of FIG. 2.

Outwardly and adjacent of the red filter strips 4c, blue filter strips4d are provided whose width is selected so that the blue stripe adjacentthe red stripe has a width which is only onethird of the width of thered stripe imaged by the lens element 3a, as is apparent from the graph6 in FIG. I. The outwardly following green filter strips 4e have a lighttransmission of 0.5,

I as indicated at Grin FIG. 2 which is half the light transmission ofthe other color components. This lower light transmission is selectedbecause in the arrangement of FIG. 1, the green stripes imaged byadjacent lens elements 3a, 3b are superimposed on each other so that thetwo images together result in sufficient intensity of the green colorcomponent.

The same effect could be obtained if each of two adjacent lens elements30, 3b would image a green stripe of only half the width of theillustrated green stripe, but having full intensity, provided that thetwo green stripes of adjacent lens elements are directly adjacent eachother. In both cases, the graph 7 represents the distribution of theimages of the green filter strips.

All images of the strips 4 formed by all lens elements of the lenticulargrating 3, form on the photosensitive surface 2, a strip grating. Whenthe film is exposed, the brightness values of the object imaged by theobjective in, 1b are superimposed on the colored strip grating so thatthe same is correspondingly modulated. After exposure of thephotosensitive layer of film 2, the same is separated from thelenticular grating 3 and developed in the usual manner, so that a blackand white picture appears on the photosensitive surface. In addition,three superimposed strip gratings extending in the same direction arevisible on the film.

The manner in which the three color informations with the .associatedcolor values are reproduced is disclosed in our copending applicationSer. No. 803,676, and will be briefly described with reference to FIG.5. A source of light 8, which should be as small and point-shaped aspossible, is imaged by a condenser 9 on an intermediate diaphragm 10which has two diametrically spaced openings. The developed film 11having the photosensitive surface 2 with images as described above, isplaced directly behind condenser 9, and is imaged on a screen 13 by anobjective 12 which is arranged as closely as possible to the diaphragm10. The image of the lamp 8 is projected by condenser 9 into the planeof diaphragm 10. Outside of the place of a direct image, which may bedescribed as the zero diffraction order, concentrations of light, theso-called higher diffraction orders, are formed at different points ofthe plane of the diaphragm 10, depending on the fineness and directionof the strip grating on the photosensitive surface of film 11. If thegrating is strictly sinusoidal, only the first diffraction order isproduced, while gratings having harmonic characteristics of the higherorder, cause diffraction phenomena of the higher orders.

The radial deviation of the diffraction from the optical axis isdetermined by the fineness of the grating, and by the angular positionof the diffraction brightness in relation to the azimuthal position ofthe grating. By selecting the grating constant and angle, it can bedetenuined where the respective diffraction order occurs in the plane ofthe diaphragm. Therefore, it is convenient to refer to a local frequencyspectrum, while the grating effects the transfer of informationregarding the picture in the manner of a carrier frequency.

Since the diaphragm 10 has an impermeable central portion, a directimage of the source of light in the plane of the diaphragm is blocked,while the rays of the higher diffraction orders are projected throughthe corresponding openings in the outer portions of diaphragm 10 throughobjective 12 onto screen 13. In this manner, a picture of the objectimaged on the photosensitive surface of film 11 is formed on screen 13only by rays produced by diffraction phenomena.

Since by the grating constant of the several gratings associated withdifferent color components, the angular deflection from the opticalaxis, or the radius of the mean deviation is determined, the position ofthe light concentration of every color component, and of everydiffraction order in the intermediate diaphragm plane is determined.Therefore, the diaphragm plane may be referred to as selection plane forthe local frequency. By arranging of color filter strips of therespective color at these points, the result can be obtained that onlylight pertaining to the respective color component reaches the objectivel2 and is projected onto screen 13 on which the color picture composedof the color components is formed.

In the embodiment of FIGS. 3 and 4, the objective also consists of frontand rear portions 1a and 1b between which a set of strips 14 is disposedin the objective plane 15. A lenticular grating consisting ofperpendicularly crossing rows of spherical lens elements is provided inthe front of a photosensitive surface, not shown, as described withreference to FIG. 1. As in the embodiment of FIG. 1, objective la, lbfonns a black and white image on the photosensitive surface, while theset of filter strips 14 is imaged by each lens element of the lenticulargrating 16 on the corresponding square area of the photosensitivesurface so that a strip grating is exposed and recorded on thephotosensitive surface. FIG. 3 shows schematically that three filterstrips associated with three color components cross each other in theoptical axis of objective la and 1b. FIG. 4 more clearly shows that theset of filter strips 14 includes a diagonally extending filter strip 17permeable for green light, and another diagonal filter strip 18permeable for blue light and crossing filter strip 17 at right angles. Athird filter strip 19 extends at an angle of 45 to the green and bluefilter strips 17 and 18, and is permeable for red light. Filter strips17 and 18 have the same width, and the filter strip 19 has a greaterwidth which is /5 times the width of filter strips 17 and 18. The colorcomponents occur only where there are no strip portions superimposed.Where the red and blue strips overlap, the filter color is purple, wherethe green and red strips overlap, the filter color is yellow, and in thecentral square in which all three strips l7, l8, l9 overlap, all colorscan pass through the filters. The outer ends of filter strips 17, 18, 19are shaped so that the entire set of filter strips has a square area.When this square area is imaged by each of the lens elements of thelenticular grating 16 on a photosensitive surface, corresponding squareareas of the same receive images which together form a strip grating onthe entire photosensitive surface since the imaged square areas aredirectly adjacent each other. The photosensitive surface has thus theimage of three colormodulated strip gratings slanted at the same anglesas the filter strips 17,18 and 19.

The lenticular grating 16 which is composed of crossing rows of squarespherical lenses can be made by a stamping operation of syntheticplastic material. It is also possible to produce the lenticular gratingby a photographic process. As has been found by tests, the quality ofreproductions obtained by photographically made lenticular gratings issufficient for the purpose of the invention. Lenticular grating made byaphotographic process can be made to a very fine pitch which isadvantageous since the area of each image picture element must conformto the size of the respective lens element so that a lenticular gratinghaving a fine pitch is required for highqirality reproductions.

For obtaining a colored picture of a photosensitive layer exposed by theapparatus of FIG. 3, the apparatus described with reference to FIG. 5can be used. As illustrated in FIG. 6, successive brightnessconcentrations occur at different angles in the diaphragm plane 10,which are respectively correlated with one of the three colorcomponents. The angles between the brightness concentrations correspondto azimuthal angular positions of the diffraction gratings. At each ofthe brightness concentrations, in a direction from the center outward,the color components blue, green and red with the known intermediatecolors occur at the first diffraction order, and are repeated in thesecond diffraction order. This affords the possibility to arrange adiaphragm in this plane which permits passage of the color which iscorrect for the reproduction of the respective color component, butabsorbs the remaining colors. In the plane of the picture screen 13, theobjective 12 forms a picture combining the three color components. Aparticular advantage of the arrangement is that by adjusting theapertures of the diaphragm, or by neutral filters, the color componentscan be balanced.

The reproduction of the black and white pictures recorded in accordancewith the invention, can be carried out by other arrangements andholographic methods, and is not an object of the present invention.

instead of exposing on the photosensitive layers three color componentimages, as described above, it is also possible to expose differentblack and white images on the photosensitive surface. A grating having avariable grating constant is used for each exposure, or the grating mayhave different azimuthal angular positions during each exposure. A gapin the plane of the objective is imaged in different positions by eachlens element of the lenticular grating so that different gratings aresuperimposed on each black and white image, or the angular position ofthe gap in the plane of the objective is placed in a different angularposition during each exposure, corresponding to the method applied inthe embodiment of FIGS. 1 and 3, respectively. The separation of thethree black and white pictures during the reproduction is effected, asdescribed with reference to FIG. 5, by apertures in the diaphragm 10,and by the respective diffraction orders.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofarrangements for photographic color recording differing from the typesdescribed above.

While the invention has been illustrated and described as embodied in amethod and apparatus for photographic recording on a black and whitefilm in such a manner that color reproduction can be obtained, it is notintended to be limited to the details shown, since various modificationsand structural changes may be made without departing in any way from thespirit of the present invention.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims.

1. Apparatus for photographic color recording, comprising an objectivefor forming an image on a photosensitive surface and having an opticalaxis; a set of different filter strips associated with different colorcomponents for selectively filtering image-forming rays passing throughsaid objective, said strips being angularly spaced about said opticalaxis and being superimposed in a central area permeable to all colorcomponents of light, portions of only a pair of different strips beingsuperimposed outside of said central area and being penneable to the twocolor components of the respective pair of different strips; and alenticular grating located between said objective and saidphotosensitive surface and covering the latter, said grating including aplurality of lens elements for respectively projecting the filtered raysassociated with different color components onto correlated areas of saidphotosensitive surface so that each lens element forms an image of saidset of filter strips on the respective area whereby all images of saidstrips form a strip grating on the entire photosensitive surface, theimage formed by said objective on said photosensitive surface beingreproducible by the difiraction orders of said strip grating.

2. Apparatus as claimed in claim 1 wherein said objective has a frontpart and a rear part and an objective plane between the same; andwherein said filter strips are located in said objective plane.

3. Apparatus as claimed in claim 1 wherein filter strips associated withdifferent color components have different widths.

4. Apparatus as claimed in claim 1 wherein filter strips associated withdifferent color components have different angular positions.

5. Apparatus for photographic color recording, comprising an objectivefor forming an image on a photosensitive surface and having an opticalaxis and a plane of symmetry passing through said axis; a set ofdifferent filter strips associated with different color components forselectively filtering imageforming rays passing through said objective,said strips including pairs of filter strips and each pair of suchfilter strips being associated with a different color component, thefilter strips of each of said pairs being disposed on opposite sides ofsaid plane of symmetry and being symmetrical to the same; and alenticular grating located between said objective and saidphotosensitive surface and covering the latter, said grating including aplurality of lens elements for projecting the filtered rays associatedwith different color components onto correlated areas of saidphotosensitive surface, respectively, so that each lens element forms animage of said set of filter strips on the respective area whereby allimages of said strips form a strip grating on the entire photosensitivesurface, the image formed by said objective on said photosensitivesurface being reproducible as a color picture by the diffraction ordersof said strip grating.

6. Apparatus as claimed in claim 5 wherein a first pair of filter stripsimpermeable to a first color component is located on opposite sides of astrip-shaped area permeable to all color components; wherein a secondpair of strips permeable to a second color component is located outsideof said first pair of strips; wherein a third pair of strips penneablefor the first color component is located outside of said third pair; andwherein a fourth pair of strips permeable for a third color component islocated outside of said third pair of strips.

7. Apparatus as claimed in claim 6 wherein said first pair of strips hasnarrow yellow strips impermeable for blue; wherein said second pair ofstrips is permeable for red; wherein said third pair of strips ispermeable for blue; wherein said fourth pair of strips is permeable forgreen.

8. Apparatus as claimed in claim 6 wherein said strips are parallel andform on opposite sides of said plane of symmetry two groups of adjacentstrips; wherein said strips of each pair have the same width, and stripsof different pairs have different widths so that the colored imagesformed by said lens elements of the strips of said first, second andthird pairs of strips have widths in the ratio of 1:2:3.

9. Apparatus as claimed in claim 8 wherein said lens elements of saidlenticular grating are cylinder lenses having axes parallel to saidplane of symmetry and to said strips.

10. Apparatus as claimed in claim 6 wherein the strips of said fourthpair of strips of each lens element have such a width and position thatthe images thereof are superimposed on the images of the strips of thefourth pairs of strips formed by the adjacent lens elements; and whereinsaid strips of said fourth pairs of strips transmit half the amount oflight transmitted by the other strips so that the superimposed imageshave the same brightness as the images formed by said other strips.

11. Apparatus as claimed in claim 6 wherein the strips of said fourthpair of strips of each lens element have such a width and positions thatthe images thereof are located directly adjacent to the strips of thefourth pairs of strips formed by adjacent lens elements.

12. Apparatus for photographic color recording, comprising an objectivefor forming an image on a photosensitive surface and having an opticalaxis; a set of different filter strips associated with different colorcomponents for selectively filtering image-forming rays passing throughsaid objective, said strips being angularly spaced about said opticalaxis and being superimposed in a central area permeable to all colorcomponents of light, portions of two different strips being superimposedand permeable to the respective two color components, two of said stripshaving the same width, being associated with two different colorcomponents and being disposed perpendicularly to each other, a furtherstrip associated with a third color component defining an angle of 45with said two strips of the same width and having a width 2 timesgreater than the width of said two strips having the same width; and alenticular grating located between said objective and saidphotosensitive surface and covering the latter, said grating including aplurality of lens elements for projecting the filtered rays associatedwith different color components onto correlated areas of saidphotosensitive surface, respectively, so that each lens element forms animage of said set of filter strips on the respective area whereby allimages of said strips form a strip grating on the entire photosensitivesurface, the image formed by said objective on said photosensitivesurface being reproducible as a color picture by the diffraction ordersof said strip grating.

13. Apparatus for photographic color recording, comprising an objectivefor fon'ning an image on a photosensitive surface and having an opticalaxis; a set of different filter strips assoeiated with different colorcomponents for selectively filtering image-forming rays passing throughsaid objective, said strips being angularly spaced about said opticalaxis and being superimposed in a central area permeable to all colorcomponents of light, portions of two different strips being superimposedand permeable for the respective two color components and said angularlyspaced strips being located within a square area; and a lenticulargrating located between said objective and said photosensitive surfaceand covering the laxter, said grating including a plurality of lenselements for projecting the filtered rays associated with differentcolor components onto correlated areas of said photosensitive surface,respectively, so that each lens element forms an image of said set offilter strips on the respective area whereby all images of said stripsfonn a strip grating n the entire photosensitive surface, the imageformed by said objective on said photosensitive surface beingreproducible as a color picture by the diffraction orders of said stripgrating, said lens elements of said lenticular grating being sphericallenses arranged in perpendicularly crossing rows to image said angularlyspaced strips on corresponding square areas of said photosensitivesurfacev 14. Apparatus for photographic color recording, comprising anobjective for forming an image on a photosensitive surface and having anoptical axis; a set of different filter strips associated withdifferentcolor components for selectively filtering image-forming rayspassing through said objective, said strips being angularly spaced aboutsaid optical axis and being superimposed in a central area permeable toall color components of light, portions of two different strips beingsuperimposed and permeable to the respective two color components, twostrips having the same width, being associated with green and blue,respectively, and being disposed perpendicularly to each other, a thirdstrip associated with red defining an angle of 45 with said two stripsof the same width and being superimposed on portions of the same, saidthird strip having a width greater than the width of said two strips ofthe same width and all said strips being superimposed in the region ofsaid axis to form a square central area permeable to all colorcomponents of light; and a lenticular grating located between saidobjective and said photosensitive surface and covering the latter, saidgrating including a plurality of lens elements for projecting thefiltered rays associated with different color components onto correlatedareas of said photosensitive surface, respectively, so that each lenselement forms an image of said set of filter strips on the respectivearea whereby all images of said strips form a strip grating on theentire photosensitive surface, the image formed by said objective onsaid photosensitive surface being reproducible as a color picture by thediffraction orders of said strip grating.

1. Apparatus for photographic color recording, comprising an objectivefor forming an image on a photosensitive surface and having an opticalaxis; a set of different filter strips associated with different colorcomponents for selectively filtering imagE-forming rays passing throughsaid objective, said strips being angularly spaced about said opticalaxis and being superimposed in a central area permeable to all colorcomponents of light, portions of only a pair of different strips beingsuperimposed outside of said central area and being permeable to the twocolor components of the respective pair of different strips; and alenticular grating located between said objective and saidphotosensitive surface and covering the latter, said grating including aplurality of lens elements for respectively projecting the filtered raysassociated with different color components onto correlated areas of saidphotosensitive surface so that each lens element forms an image of saidset of filter strips on the respective area whereby all images of saidstrips form a strip grating on the entire photosensitive surface, theimage formed by said objective on said photosensitive surface beingreproducible by the diffraction orders of said strip grating. 2.Apparatus as claimed in claim 1 wherein said objective has a front partand a rear part and an objective plane between the same; and whereinsaid filter strips are located in said objective plane.
 3. Apparatus asclaimed in claim 1 wherein filter strips associated with different colorcomponents have different widths.
 4. Apparatus as claimed in claim 1wherein filter strips associated with different color components havedifferent angular positions.
 5. Apparatus for photographic colorrecording, comprising an objective for forming an image on aphotosensitive surface and having an optical axis and a plane ofsymmetry passing through said axis; a set of different filter stripsassociated with different color components for selectively filteringimage-forming rays passing through said objective, said strips includingpairs of filter strips and each pair of such filter strips beingassociated with a different color component, the filter strips of eachof said pairs being disposed on opposite sides of said plane of symmetryand being symmetrical to the same; and a lenticular grating locatedbetween said objective and said photosensitive surface and covering thelatter, said grating including a plurality of lens elements forprojecting the filtered rays associated with different color componentsonto correlated areas of said photosensitive surface, respectively, sothat each lens element forms an image of said set of filter strips onthe respective area whereby all images of said strips form a stripgrating on the entire photosensitive surface, the image formed by saidobjective on said photosensitive surface being reproducible as a colorpicture by the diffraction orders of said strip grating.
 6. Apparatus asclaimed in claim 5 wherein a first pair of filter strips impermeable toa first color component is located on opposite sides of a strip-shapedarea permeable to all color components; wherein a second pair of stripspermeable to a second color component is located outside of said firstpair of strips; wherein a third pair of strips permeable for the firstcolor component is located outside of said third pair; and wherein afourth pair of strips permeable for a third color component is locatedoutside of said third pair of strips.
 7. Apparatus as claimed in claim 6wherein said first pair of strips has narrow yellow strips impermeablefor blue; wherein said second pair of strips is permeable for red;wherein said third pair of strips is permeable for blue; wherein saidfourth pair of strips is permeable for green.
 8. Apparatus as claimed inclaim 6 wherein said strips are parallel and form on opposite sides ofsaid plane of symmetry two groups of adjacent strips; wherein saidstrips of each pair have the same width, and strips of different pairshave different widths so that the colored images formed by said lenselements of the strips of said first, second and third pairs of stripshave widths in the ratio of 1:2:3.
 9. Apparatus as claimed in claim 8wherEin said lens elements of said lenticular grating are cylinderlenses having axes parallel to said plane of symmetry and to saidstrips.
 10. Apparatus as claimed in claim 6 wherein the strips of saidfourth pair of strips of each lens element have such a width andposition that the images thereof are superimposed on the images of thestrips of the fourth pairs of strips formed by the adjacent lenselements; and wherein said strips of said fourth pairs of stripstransmit half the amount of light transmitted by the other strips sothat the superimposed images have the same brightness as the imagesformed by said other strips.
 11. Apparatus as claimed in claim 6 whereinthe strips of said fourth pair of strips of each lens element have sucha width and positions that the images thereof are located directlyadjacent to the strips of the fourth pairs of strips formed by adjacentlens elements.
 12. Apparatus for photographic color recording,comprising an objective for forming an image on a photosensitive surfaceand having an optical axis; a set of different filter strips associatedwith different color components for selectively filtering image-formingrays passing through said objective, said strips being angularly spacedabout said optical axis and being superimposed in a central areapermeable to all color components of light, portions of two differentstrips being superimposed and permeable to the respective two colorcomponents, two of said strips having the same width, being associatedwith two different color components and being disposed perpendicularlyto each other, a further strip associated with a third color componentdefining an angle of 45* with said two strips of the same width andhaving a width Square Root 2 times greater than the width of said twostrips having the same width; and a lenticular grating located betweensaid objective and said photosensitive surface and covering the latter,said grating including a plurality of lens elements for projecting thefiltered rays associated with different color components onto correlatedareas of said photosensitive surface, respectively, so that each lenselement forms an image of said set of filter strips on the respectivearea whereby all images of said strips form a strip grating on theentire photosensitive surface, the image formed by said objective onsaid photosensitive surface being reproducible as a color picture by thediffraction orders of said strip grating.
 13. Apparatus for photographiccolor recording, comprising an objective for forming an image on aphotosensitive surface and having an optical axis; a set of differentfilter strips associated with different color components for selectivelyfiltering image-forming rays passing through said objective, said stripsbeing angularly spaced about said optical axis and being superimposed ina central area permeable to all color components of light, portions oftwo different strips being superimposed and permeable for the respectivetwo color components and said angularly spaced strips being locatedwithin a square area; and a lenticular grating located between saidobjective and said photosensitive surface and covering the laxter, saidgrating including a plurality of lens elements for projecting thefiltered rays associated with different color components onto correlatedareas of said photosensitive surface, respectively, so that each lenselement forms an image of said set of filter strips on the respectivearea whereby all images of said strips form a strip grating on theentire photosensitive surface, the image formed by said objective onsaid photosensitive surface being reproducible as a color picture by thediffraction orders of said strip grating, said lens elements of saidlenticular grating being spherical lenses arranged in perpendicularlycrossing rows to image said angularly spaced strips on correspondingsquare areas of said photosensitive surface.
 14. Apparatus forphotographic color recording, comprising an objecTive for forming animage on a photosensitive surface and having an optical axis; a set ofdifferent filter strips associated with different color components forselectively filtering image-forming rays passing through said objective,said strips being angularly spaced about said optical axis and beingsuperimposed in a central area permeable to all color components oflight, portions of two different strips being superimposed and permeableto the respective two color components, two strips having the samewidth, being associated with green and blue, respectively, and beingdisposed perpendicularly to each other, a third strip associated withred defining an angle of 45* with said two strips of the same width andbeing superimposed on portions of the same, said third strip having awidth greater than the width of said two strips of the same width andall said strips being superimposed in the region of said axis to form asquare central area permeable to all color components of light; and alenticular grating located between said objective and saidphotosensitive surface and covering the latter, said grating including aplurality of lens elements for projecting the filtered rays associatedwith different color components onto correlated areas of saidphotosensitive surface, respectively, so that each lens element forms animage of said set of filter strips on the respective area whereby allimages of said strips form a strip grating on the entire photosensitivesurface, the image formed by said objective on said photosensitivesurface being reproducible as a color picture by the diffraction ordersof said strip grating.